The Ni-Mn-Ga-based alloys are a subject of intensive studies because of their unique coupling of magnetic and mechanical properties known as magnetic field-induced straining effect [1]. Most extensive research in this area was focused on single crystals however, also polycrystalline materials produced by different methods are also widely studied [2]. One of them is the melt spinning method, which produced polycrystalline materials in the ribbons shape [3,4]. Thus, a main aim of this work was to produce six alloys of the chemical composition Ni_50-xMn₂₅Ga_25-yCo_xCu_y (x,y = 1-6) in the form of thin ribbons using this method. In order to optimize this production technique, Ni₄₄Mn₂₅Ga₁₉Co₆Cu₆ ingot was selected to produce melt-spun ribbons with different rotational velocities of a copper wheel. This material was characterized by the presence of only a non-modulated martensite phase. Then, the effect of melt-spinning parameters on the microstructure, martensitic transformation temperature and magneto-mechanical properties of the produced ribbons was studied. Afterwards, the most optimal rotational velocity was used to obtain remaining melt-spun ribbons of the chemical compositions Ni_50-xMn₂₅Ga_25-yCo_xCu_y (x, y = 1-5). Temperature dependence on microstructure, martensitic transformation temperature and magneto-mechanical properties was studied. Melt-spun ribbons of all six chemical compositions were annealed at different temperatures. Phase composition of as-melted and annealed ribbons was analysed using X-ray diffraction technique. Changes in the microstructure of the ribbons were studied using electron backscattered diffraction method in a scanning electron microscope. The characteristic forward and reverse martensitic transformation temperatures were determined by differential scanning calorimetry method. Magneto-mechanical properties of as-melted and annealed ribbons were determined during bending tests in the conditions of an external magnetic field to study the magnetic field-induced bending effect.